Airtight seal/use indicator for a film cartridge

Details Airtight seal/use indicator for a film cartridge Airtight seal/use indicator for a film cartridge

1992-03-30

1993-08-03

Jillions, John M.

Winding, tensioning, or guiding

Coil holder or support

Spool or core

354275, G03B 1726

Patent

active

052321754

ABSTRACT:
In a film cartridge, a spool hub has a coaxial cavity in one end portion. A cartridge housing for the spool hub has a hole in one end wall that is aligned with the cavity to permit access to the cavity through the hole. A hermetic plug is sized to fit tightly in the hole to act as an airtight seal for the hole, but is sufficiently compliant to permit it to be forcibly pushed intact from the hole into the cavity to provide a visible indication that the film cartridge has been used.

REFERENCES:
patent: 1528128 (1925-03-01), Peterson
patent: 2458383 (1949-01-01), Isaac
patent: 3620475 (1971-11-01), Penn
patent: 4058823 (1977-11-01), Mitchell et al.
patent: 4514070 (1985-04-01), Norris
patent: 4630915 (1986-12-01), Whiteside et al.
patent: 4647170 (1987-03-01), Stoneham
patent: 4682870 (1987-07-01), Atkinson
patent: 5032862 (1991-07-01), Behnke

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